Refer to the Graph Below

Multiple Choice

Refer to the graph below.The Keeling curve,shown here,provides us with more than a half-century of precise measurements of atmospheric CO₂ concentrations over Mauna Loa,Hawaii.Do these data show a trend,and if so,what is the trend?

A) No;the data appear random.
B) No;the data show constant variability,not a definite trend.
C) Yes;the data show a slight,but insignificant,upward trend.
D) Yes;the data show an upward trend,but variability makes it invalid.
E) Yes;the data show a definite upward trend with predictable seasonal variations.